Split rivet.



EDWIN BALL STIMPSON, OF NEW YORK, N. Y.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed 00 b8 11, 1906. Serial N0. 338,435.

T0 all whom may concem:

Be lt known tl1at I, EDWIN BALL STIMPSON, a citizen ol' the UnitedStates, resicling in the borough of Brooklyn, county of Kings, city andStato of New York, have invented certain new and useful Improvements inSplit Rivets, of which the following is a specification.

This invention relates to the general dass 0f split rivets 0f whicl1tl1ose used in securing Ehe encls 0f driving belts are examples.According to the present invention tl1e rivet is formed from tho solid1netal With the shank flattened and slitted edgewise so as so producetwo broad prongs Wl1ich are widest at their tips o1 free encls, as willbe hereinafter explained.

Another feature of the invention resides in the plate through whicll therivet passes in connecting the ends of a belt, f0r example.

In the acconlpanying drawings, wlflch serve to illust1ate an embodiment0f the invention*Figure 1 is a perspective view of tl1e rivetblank. Fig.2 is a si1nilar view of alle blank after it has been flattened Fig. 3 isan edge view showing the rivet alter the flattened shank has beenslitted. Fig. 4 is an end view. Fig. 5 shows a part 0f a belt With theplate and rivets. Fig. 6 is a sectional view of a fragment of the plateand fabric Wlth a rivet partly inserted. Fig. 7 is an enlarged sectionalview of the plate and fabric, sl1owing the prongs of Ehe rivetclenchecl. Fig. 8 is a view showing a rivet with tl1e prongs beveled attheir tips. Fig. 9 is an end vew similar t0 Fig'. 4, showing the prongsfor1ned fro1n a sl1ank 0f quadrangular form in crosssection.

Fig. 1 SllOWS tl1e blank for tl1e rivet, having a heacl 1 and soliolshank 2, tl1e latter being circular in crosssection and tapered from thetip toward tl1e head. This blank 1nay be produced by forging 01'pressing according to known processes.

Ifig. 2 sl1oWs the blank after the next step, which Consists in reducingtl1e metal 0f the. shank on opposite sides or faces so as t0 produce aflat blade or sten1 3. This re duction ca11 be conveniently effected bymilling' 01 cutting away the surplus metal.

Figs. 3 and 4 show the rivet after tl1e next step, which consists incutting a slot 4 in said stem widthwise, tl1us producing tw0 flatclenching prongs 5, 5, whicl1 are as wide as the sl1ank 2 (Fig. l) andWl1ich aro widest at their tips 01 free ends.

Figs. 5, 6 and 7 sl1ow the plate 6 which may be used in connection Withthe rivets in seculing togetl1er tl1e ends of a belt B, for example.This plate Will have a recess 7 for the l1ead of the rivet and t woslot-like apert'ures 8 t0 receive tl1e rivetprongs as clearly shown.

As the clench'ed prongs (see Fig. 7) are subject to abrasion andexcessive wem, in ehe use of a belt for 0x- -a1nple and often wear away150 an extent sufficient to cause the plate t0 break away fro1n thebelt, it is clesn-able that these prongs shall have considerable wearingsurface ancl mass in Order that they 1nay resist abrasion. The broad andtapered prong provi les this and also provides a broacl surface to bear011 tl1e matorial at the clench. The apertured plate also provid estl1at the clenchecl prongs shall all lie in one lirection, astransversely of tl1e Width of a belt.

Fig. 8 sl1ows 110W the tips of tl1e prongs 5 may be beveled afu tl1einside. This beveling provides an edge to penetrato the material B, anclalso, wl1en tl1e bevels are at the inside, it tends to spreacl tl1eprongs whon they are driven. But tl1e particular shape of the tips oftl1e prongs is n0t important t0 this invention.

Fig. 9 shows how the shank 2 may be quadrangular, or of some otl1er formthan round in cross-section.

It Will be notecl that the rivet is not made fron1 sheetmetal nor madeup of parts, it is forged and 1nilled out 0f tl1e solid metal and is allin on piece or integral.

Having tl1us describecl lny invention, I claim A split rivet formed fromsolid metal, having a head and a shank which tapers toward the head,said sllank being flattened by reduction at its opposite sides andslitted Widthwise to forrn two clenching prongs disposed fac0 t0 face.

In witness whereof I have hereunto signed my name this 9th day ofOctoher, 1006, in tho presonce of tw0 subscribing witnesses.

' EDIVIN BALL STIMI'SON.

Witnesses HENRY CONNETT, H. G. HOSE.

